I have a similar story. Although not quite as old, accomplished or rich, i started as a teenager and could retire comfortably at 50. One thing I don't see mentioned by others is that ultimately, helping and giving to others can bring huge meaning to life. One does not have to go far on this planet to see hardship, suffering and injustice. You could choose to work for a company that has a more direct impact on people's lives. Or you could volunteer in your spare time. When I retire I intend to work on software and IT support for community groups, non profits. Give free consultation to human rights organizations. Volunteer at local repair cafes, teach children how to hack on Raspberry PIs... Invest in small businesses in Africa, help them bootstrap. There is endless work to be done to improve the world, and frankly I find people who are less self centered (not a criticism btw) seem to be happier.